20515441320 has 256 divisors, whose sum is σ = 74937312000. Its totient is φ = 4951065600.

The previous prime is 20515441283. The next prime is 20515441327. The reversal of 20515441320 is 2314451502.

20515441320 is a `hidden beast` number, since 205 + 15 + 441 + 3 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20515441327) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2716750 + ... + 2724290.

It is an arithmetic number, because the mean of its divisors is an integer number (292723875).

Almost surely, 2^20515441320 is an apocalyptic number.

20515441320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20515441320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37468656000).

20515441320 is an abundant number, since it is smaller than the sum of its proper divisors (54421870680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20515441320 is a wasteful number, since it uses less digits than its factorization.

20515441320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7801 (or 7791 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 20515441320 its reverse (2314451502), we get a palindrome (22829892822).

The spelling of 20515441320 in words is "twenty billion, five hundred fifteen million, four hundred forty-one thousand, three hundred twenty".